There were alot of options available from the factory.....never have seen that set up but my guess is going to be washdown pump....if it was a forward bilge pump I would think they would wire it to the helm with the rest of the stuff....washdown is something you tend to use in the stern so a switch easier to reach might be put there.....just a guess of course.
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1986 V-20
1986 Yamaha 150 HP
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